opencv gamma校正_opencv resize函数踩坑

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// 链接 https://blog.csdn.net/linqianbi/article/details/78617615
// Gamma 校正
#include <iostream>  
#include <opencv2\core\core.hpp>  
#include <opencv2\highgui\highgui.hpp>  
#include <opencv2\imgproc\imgproc.hpp>  
#include<cmath>
using namespace cv;

Mat gammaTransform(Mat& srcImage, float kFactor)
{

	unsigned char LUT[256];
	for (int i = 0; i < 256; i++)
	{
		float f = (i + 0.5f) / 255;
		f = (float)(pow(f, kFactor));
		LUT[i] = saturate_cast<uchar>(f * 255.0f - 0.5f);
	}
	Mat resultImage = srcImage.clone();

	if (srcImage.channels() == 1)
	{

		MatIterator_<uchar> iterator = resultImage.begin<uchar>();
		MatIterator_<uchar> iteratorEnd = resultImage.end<uchar>();
		for (; iterator != iteratorEnd; iterator++)
		{
			*iterator = LUT[(*iterator)];
		}
	}
	else
	{


		MatIterator_<Vec3b> iterator = resultImage.begin<Vec3b>();
		MatIterator_<Vec3b> iteratorEnd = resultImage.end<Vec3b>();
		for (; iterator != iteratorEnd; iterator++)
		{
			(*iterator)[0] = LUT[((*iterator)[0])];//b
			(*iterator)[1] = LUT[((*iterator)[1])];//g
			(*iterator)[2] = LUT[((*iterator)[2])];//r
		}
	}
	return resultImage;
}
int main()
{
	Mat srcImage = imread("test.jpg");
	if (!srcImage.data)
	{
		printf("could not load image...\n");
		return -1;
	}
	//取两种不同的gamma值
	float gamma1 = 3.33f;
	float gamma2 = 0.33f;
	float kFactor1 = 1 / gamma1;
	float kFactor2 = 1 / gamma2;
	Mat result1 = gammaTransform(srcImage, kFactor1);
	Mat result2 = gammaTransform(srcImage, kFactor2);
	namedWindow("demo", CV_WINDOW_AUTOSIZE);
	imshow("srcImage", srcImage);
	imshow("res1", result1);
	imshow("res2", result2);
	imwrite("Gamma.jpg", result1);
	waitKey(0);
	waitKey(0);
	return 0;
}